UNSC questions Pak on Pahalgam attack

Metro cities including Delhi, Mumbai, Chennai and Kolkata, along with border cities and locations with key infrastructure, have been identified as the most vulnerable.

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The civil defence authorities will check the capabilities of all these zones and what's lacking or not working. This exercise of identifying weak points for correction will continue for the next three days.

In Delhi, the government issued a list of "dos and don'ts" for the Operation Abhyaas at 55 locations. Citizens have been asked to learn air raid siren codes — long wails indicating alert, and short bursts signalling all-clear— and identify nearby shelters. Emergency kits, torches and bottled water are recommended.

During the exercise, people will be expected to immediately seek shelter and avoid phone use to keep lines free for emergencies.

In the Kashmir Valley, the drill will also commence at 4 pm. In Chandigarh, a city-wide blackout is scheduled between 7.30 pm and 7.40 pm, with sirens to be sounded for 10 minutes. Jharkhand will conduct blackouts, simulate evacuation of the injured, and protect infrastructure. Punjab will carry out mock drills in 20 districts.